Good point! I’m not sure why a fan coil requires a
constant volume fan, but that’s apparently the case.
How about using a ZoneHVAC:UnitHeater? Heat transfer will be
the same and the fan can be “On/Off”. This only works for
heating, not cooling.
Another possibility to get cooling capability is a UnitVentilator.
You’d have to define it with no outdoor air and a variable volume fan. If
you make the variable volume fan coefficients proportional to load (100% load =
100% power, 50% load = 50% power, etc., it should end up very close to On/Off
operation.
The Building Performance Team
James V. Dirkes II, P.E., LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653
From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of grandocu
Sent: Saturday, October 02, 2010 1:11 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: Fan Coil Night time Cycling
They would need to be connected to an airloop then right?
What if they are only set up as zonal equipment? if I use
availabilitymanager:nightcycle doesn't it only work if I can assign the
availabilitymanager:assignmentlist to something? I don't see where I can
include that into the fan coil at the zone level.
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx,
"James V Dirkes II, PE" <jim@...> wrote:
>
> Try "AvailabilityManager:NightCycle"
>
>
>
> The Building Performance Team
> James V. Dirkes II, P.E., LEED AP
> 1631 Acacia Drive NW
> Grand Rapids, MI 49504
> 616 450 8653
>
>
>
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx
> [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]
On Behalf Of grandocu
> Sent: Saturday, October 02, 2010 11:03 AM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: [EnergyPlus_Support] Fan Coil Night time Cycling
>
>
>
>
>
> Hello,
>
> How you get fan coil units to cycle on at night if the zone passes the
> setback temperature? I just want them to turn on to meet the load in the
> room. Thank you.
>
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